title: Seven-electrode EER stimulator-monitor for ambulatory monkeys.
abstract: An electrical evoked response (EER) stimulator-monitor for ambulatory monkeys is described. Seven time-multiplexed electrodes are used. The unit switches between stimulus and monitor modes at a 100-Hz rate. In the stimulus mode, 3.5 V peak, 0.45-ms pulses are applied at a 100-Hz rate to any electrode selected by means of toggle switches on a remote control panel. In the monitor mode, low-frequency -3 dB cutoff occurs at 0.2 Hz. A 20-MHz carrier is used as a local superheterodyne oscillator during the stimulus period, and as an FM transmitter during the monitor period. Three mercury cells supply 4 V at 10 mA. The unit weighs 80 g. It is 5.7 x 5 x 2.5 cm in size.
mesh_terms: D000818:Animals; D001921:Brain / Q000502:physiology*; D004558:Electric Stimulation; D004567:Electrodes, Implanted / Q000662:veterinary*; D004569:Electroencephalography / Q000662:veterinary; D005071:Evoked Potentials; D000882:Haplorhini / Q000502:physiology*; D013686:Telemetry / Q000379:methods / Q000662:veterinary*